package com.jiedeng.util;


import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

/**
 * Created by Administrator on 2018/5/23.
 */
public class ImageUtil {
    /**
     * @param originalFile 待压缩
     * @param resizedFile  压缩后
     * @param newWidth     新文件宽度
     * @param quality      百分比
     * @throws IOException
     */
   /*
    public static void resize(File originalFile, File resizedFile,
                              int newWidth, float quality) throws IOException {
        if (quality > 1) {
            throw new IllegalArgumentException(
                    "Quality has to be between 0 and 1");
        }
        ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());
        Image i = ii.getImage();
        Image resizedImage = null;

        int iWidth = i.getWidth(null);
        int iHeight = i.getHeight(null);
        if (iWidth > iHeight) {
            resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight)
                    / iWidth, Image.SCALE_SMOOTH);
        } else {
            resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight,
                    newWidth, Image.SCALE_SMOOTH);
        }
        // This code ensures that all the pixels in the image are loaded.
        Image temp = new ImageIcon(resizedImage).getImage();
        // Create the buffered image.
        BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null),
                temp.getHeight(null), BufferedImage.TYPE_INT_RGB);
        // Copy image to buffered image.
        Graphics g = bufferedImage.createGraphics();
        // Clear background and paint the image.
        g.setColor(Color.white);
        g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
        g.drawImage(temp, 0, 0, null);
        g.dispose();
        // Soften.
        float softenFactor = 0.05f;
        float[] softenArray = {0, softenFactor, 0, softenFactor,
                1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0};
        Kernel kernel = new Kernel(3, 3, softenArray);
        ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
        bufferedImage = cOp.filter(bufferedImage, null);
        // Write the jpeg to a file.
        FileOutputStream out = new FileOutputStream(resizedFile);
        // Encodes image as a JPEG data stream
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

        JPEGEncodeParam param = encoder
                .getDefaultJPEGEncodeParam(bufferedImage);
        param.setQuality(quality, true);
        encoder.setJPEGEncodeParam(param);
        encoder.encode(bufferedImage);
    }*/

    /**
     * 压缩图片
     *
     * @param srcFile
     * @param destFile
     * @param newWidth
     */
    public static void zoomImage(File srcFile, File destFile, int newWidth) {
     /*   File srcFile = new File(src);*/
        //File destFile = new File(dest);
        String dest = destFile.getPath();
        long fileSize = srcFile.length();
      /*  if(fileSize < size * 1024)   //文件大于size k时，才进行缩放,注意：size以K为单位
            return;*/

        // Double rate = (newWidth * 1024 * 1.0) / fileSize; // 获取长宽缩放比例
        // 获取长宽缩放比例
        Double rate =0.8;
        BufferedImage bufImg = null;
        try {
            bufImg = ImageIO.read(srcFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
        Image Itemp = bufImg.getScaledInstance(bufImg.getWidth(), bufImg.getHeight(), bufImg.SCALE_SMOOTH);

        AffineTransformOp ato = new AffineTransformOp(AffineTransform.getScaleInstance(rate, rate), null);
        Itemp = ato.filter(bufImg, null);
        try {
            ImageIO.write((BufferedImage) Itemp, dest.substring(dest.lastIndexOf(".") + 1), destFile);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}
